Fair Value of Financial Instruments (Components Of The Transfers In And Out Of Level 3) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers Into Level 3	$ 192	$ 105	$ 518
Transfers Out of Level 3	(1,014)	(567)	(331)
Transfers Into or Out of Level 3, Net	(822)	(462)	187
Corporate Bonds [Member] | Fixed Maturity AFS Securities [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers Into Level 3	173	78	458
Transfers Out of Level 3	(222)	(140)	(88)
Transfers Into or Out of Level 3, Net	(49)	(62)	370
ABS [Member] | Fixed Maturity AFS Securities [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers Into Level 3	9
Transfers Out of Level 3	(495)
Transfers Into or Out of Level 3, Net	(486)
U.S. Government Bonds [Member] | Fixed Maturity AFS Securities [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers Into Level 3	5		5
Transfers Into or Out of Level 3, Net	5		5
RMBS [Member] | Fixed Maturity AFS Securities [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers Out of Level 3	(17)	(12)	(11)
Transfers Into or Out of Level 3, Net	(17)	(12)	(11)
CMBS [Member] | Fixed Maturity AFS Securities [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers Into Level 3		1	3
Transfers Out of Level 3	(7)	(40)	(59)
Transfers Into or Out of Level 3, Net	(7)	(39)	(56)
CLOs [Member] | Fixed Maturity AFS Securities [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers Into Level 3			46
Transfers Out of Level 3		(206)	(152)
Transfers Into or Out of Level 3, Net		(206)	(106)
State And Municipal Bonds [Member] | Fixed Maturity AFS Securities [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers Into Level 3			2
Transfers Out of Level 3			(1)
Transfers Into or Out of Level 3, Net			1
Hybrid And Redeemable Preferred Securities [Member] | Fixed Maturity AFS Securities [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers Out of Level 3			(14)
Transfers Into or Out of Level 3, Net			(14)
Equity AFS Securities [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers Out of Level 3		(162)
Transfers Into or Out of Level 3, Net		(162)
Trading Securities [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers Into Level 3	5		4
Transfers Out of Level 3	(273)	(7)	(5)
Transfers Into or Out of Level 3, Net	$ (268)	(7)	(1)
Equity Securities [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers Into Level 3		26
Transfers Out of Level 3			(1)
Transfers Into or Out of Level 3, Net		$ 26	$ (1)